Pb^(2+)胁迫对桐花树碳代谢相关生理因子的影响  

Effects of Pb^(2+) Stress on Some Physiological Characters of the Carbohydrate Metabolism of Aegiceras corniculatum

作　　者：吴世军[1] 

机构地区：[1]泉州师范学院湿地研究所,福建泉州362000

出　　处：《集美大学学报（自然科学版）》2011年第6期413-417,共5页Journal of Jimei University：Natural Science

基　　金：泉州市科技计划项目(2009Z56)

摘　　要：研究Pb2+胁迫对桐花树碳代谢相关生理特性的影响,结果表明:桐花树幼苗对Pb2+胁迫的耐受性强,在时间和质量比上,其碳代谢相关生理指标受到Pb2+胁迫的双重影响.桐花树幼苗叶片叶绿素含量和Hill反应活性对外源Pb2+胁迫具有相同的响应趋势.当培养土中Pb2+质量比为500 mg/kg时,桐花树幼苗叶片叶绿素含量和hill反应活性升高;随着Pb2+质量比的升高以及胁迫时间的延长,桐花树幼苗叶片叶绿素含量与Hill反应活性均显著降低.实验还显示,叶绿素a对Pb2+胁迫较叶绿素b更为敏感;Hill反应活性对于Pb2+胁迫的反应比叶绿素含量更为敏感.在500～2 000 mg/kg Pb2+胁迫范围内,淀粉酶活性随胁迫质量比的升高而升高,经Pb2+胁迫处理15 d的样品,其淀粉酶活性总体上高于处理3 d的样品,但当Pb2+质量比达3 000 mg/kg时,淀粉酶的活性则显著下降.Some related physiological characters of the carbohydrate metabolism of Aegiceras corniculatum under Pb2＋ stress were researched.The results showed that Aegiceras corniculatum had a strong resistant to Pb2＋ stress and the carbohydrate metabolism was affected by both the duration and the concentration of Pb2＋ stress.It showed that the activities of Hill reaction and the content of chlorophyll in the seedlings were increased when the Pb2＋ concentration in the cultivation soils rose to 500 mg/kg.However,the factors mentioned above showed a significant decrease with a higher Pb2＋ concentration as well as a longer duration of the stress.Experiments showed that chlorophyll a was more sensitive than chlorophyll b to Pb2＋ stress,and the Hill reaction activity of the plants showed more sensitivity than that of chlorophyll content for the Pb2＋ stress.Under the range of 500 ~ 2000 mg·kg-1 Pb2＋ stress,amylase activity increased with the Pb2＋ concentration.The amylase activity of the samples treated with Pb2＋ for 15 days was higher than that of the samples treated for 3 days.However,the amylase activity was significantly decreased when the Pb2＋ concentration reached to 3000 mg·kg-1.

关 键 词：Pb2+胁迫 碳代谢 叶绿素 淀粉酶 桐花树 

分 类 号：Q945.11[生物学—植物学]